Scroll compressor

Abstract

A scroll compressor capable of improving the performance and efficiency of the compressor by introducing an intermediate pressure refrigerant to increase the amount of refrigerant discharged from a compression chamber. [Solution] The compressor includes a housing, a motor provided within the housing, a rotating shaft rotated by the motor, a rotating scroll that orbits in conjunction with the rotating shaft, and a fixed scroll that forms a compression chamber with the orbiting scroll, wherein the housing includes a rear housing that forms a discharge chamber that accommodates refrigerant discharged from the compression chamber, and between the fixed scroll and a partition wall of the rear housing, an introduction chamber is defined within the rear housing into which refrigerant flows from outside the housing, and an injection valve assembly is provided that guides the refrigerant in the introduction chamber to the compression chamber, and the partition wall is provided with a step upon which part of the injection valve assembly is seated.

Description

Technical Field

[0001] The present invention relates to a scroll compressor, and more particularly, to a scroll compressor that can improve the performance and efficiency of the compressor by introducing not only refrigerant at the suction pressure but also refrigerant at the intermediate pressure into the compression chamber of the scroll compressor and increasing the refrigerant discharge amount discharged from the compression chamber.

Background Art

[0002] Generally, an air conditioner (A / C) for indoor heating and cooling is installed in an automobile. Such an air conditioner includes a compressor that compresses a low-temperature and low-pressure vapor refrigerant drawn from an evaporator into a high-temperature and high-pressure vapor refrigerant and sends it to a condenser as a configuration of a cooling system.

[0003] Compressors include reciprocating types that compress refrigerant by the reciprocating motion of a piston and rotary types that perform compression while rotating. Reciprocating types include a crank type that uses a crank to transmit power to a plurality of pistons by a drive source transmission method, a swash plate type that transmits power to a shaft on which a swash plate is installed, etc. Rotary types include a vane rotary type that uses a rotating rotary shaft and vanes, and a scroll type that uses a orbiting scroll and a fixed scroll.

[0004] Scroll compressors can obtain a relatively high compression ratio compared to other types of compressors, and are widely used for refrigerant compression in air conditioners and the like because of the advantages that the refrigerant suction, compression, and discharge strokes are smoothly connected and a stable torque can be obtained.

[0005] FIG. 1 is a cross-sectional view illustrating a conventional scroll compressor. Referring to the attached FIG. 1, a conventional scroll compressor includes a housing (100), a motor (200) provided in the housing (100), a rotating shaft (300) rotated by the motor (200), an orbiting scroll (400) that is rotated in conjunction with the rotating shaft (300), and a fixed scroll (500) that forms a compression chamber (C) together with the orbiting scroll (400).

[0006] In a conventional scroll compressor configured as described above, when power is applied to the motor (200), the rotating shaft (300) rotates together with the rotor of the motor (200), and the orbiting scroll (400) is interlocked with the rotating shaft (300) and performs an orbiting motion. Due to such an orbiting motion of the orbiting scroll (400), the refrigerant is sucked into the compression chamber (C) and compressed, and a series of processes of discharging from the compression chamber (C) are repeated.

[0007] However, in such a conventional scroll compressor, there is a problem that the refrigerant discharge amount discharged from the compression chamber (C) is fixed, and there are limitations in improving the performance and efficiency of the compressor.

Summary of the Invention

Problems to be Solved by the Invention

[0008] An object of the present invention is to provide a scroll compressor capable of improving the performance and efficiency of the compressor by introducing not only the refrigerant at the suction pressure but also the refrigerant at the intermediate pressure into the compression chamber of the scroll compressor and increasing the refrigerant discharge amount discharged from the compression chamber. The technical problems to be realized by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those having ordinary knowledge in the technical field to which the present invention belongs from the following.

Means for Solving the Problems

[0009] One embodiment of the present invention for solving the above problems includes a housing, a motor provided in the housing, a rotating shaft rotated by the motor, a swivel scroll that is interlocked with the rotating shaft and performs a swiveling motion, and a fixed scroll that forms a compression chamber together with the swivel scroll. The housing includes a rear housing that forms a discharge chamber for accommodating the refrigerant discharged from the compression chamber. Between the fixed scroll and the partition wall of the rear housing, an injection valve assembly is provided that partitions an introduction chamber through which the refrigerant flows into the housing from the outside into the rear housing and guides the refrigerant in the introduction chamber to the compression chamber. The partition wall is provided with a step on which a part of the injection valve assembly is mounted. A scroll compressor is provided.

[0010] According to an embodiment, the partition wall protrudes from the rear mirror plate of the rear housing so as to form the space of the introduction chamber inside, and the step can be formed along the inner circumference of the partition wall.

[0011] According to an embodiment, the injection valve assembly includes a gasket retainer for preventing leakage between the discharge chamber and the introduction chamber, and the gasket retainer can be coupled to the partition wall so as to surround the step.

[0012] According to an embodiment, the peripheral shape and dimensions of the gasket retainer can be the same as the outer peripheral shape and dimensions of the partition wall.

[0013] According to an embodiment, the injection valve assembly further includes a cover plate mounted on the step and having an inlet through which the refrigerant in the introduction chamber flows in, an injection valve interposed between the cover plate and the gasket retainer and opening and closing the inlet, and a valve plate coupled to the gasket retainer and having an outlet through which the refrigerant flowing in through the inlet flows out.

[0014] According to an embodiment, the outer peripheral shape and dimensions of the step can be the same as the peripheral shape and dimensions of the cover plate.

[0015] According to an embodiment, the height (h) of the step can be the same as the thickness (t) of the cover plate.

[0016] According to an embodiment, the gasket retainer can be compressed between the partition wall and the valve plate, and the injection valve can be compressed between the gasket retainer and the cover plate.

[0017] According to an embodiment, the gasket retainer includes a bead portion protruding from the upper surface of the gasket retainer facing the partition wall, and the bead portion can surround the injection valve.

[0018] According to an embodiment, when the gasket retainer is assembled between the partition wall and the valve plate, the bead portion is pressed by the partition wall in a direction toward the valve plate, and an inner portion of the gasket retainer facing the injection valve can be bent in a direction toward the injection valve.

[0019] According to an embodiment, the gasket retainer can further include one or more retainer portions that are inclined in a direction in which the injection valve is opened.

[0020] According to an embodiment, the fastening bolt can penetrate the valve plate and the gasket retainer and be fastened to the rear housing.

[0021] According to an embodiment, one end of the positioning pin can be inserted into the valve plate, penetrate the gasket retainer, the injection valve, and the cover plate, and the other end can be inserted into the rear housing.

[0022] According to the embodiment, the housing further includes a center housing through which the rotation axis penetrates, and a front housing that forms a motor accommodation space in which the motor is accommodated together with the center housing. The inhaled refrigerant flows in through the front housing and is introduced into the compression chamber. At least a part of the refrigerant discharged to the outside of the housing can flow into the introduction chamber from the outside of the housing in an intermediate pressure state and then flow into the compression chamber through the injection valve assembly.

Advantages of the Invention

[0023] According to the present invention, by introducing not only the refrigerant at the suction pressure but also the refrigerant at the intermediate pressure into the compression chamber of the scroll compressor, the refrigerant discharge amount discharged from the compression chamber can be increased, and the performance and efficiency of the compressor can be improved.

[0024] Also, since a part of the injection valve assembly, for example, the cover plate, is mounted on the step provided on the partition wall of the rear housing, the cover plate itself can serve as a seal to prevent internal leakage between the discharge chamber and the introduction chamber. Thereby, it is not necessary to separately provide an O-ring and groove processing for the O-ring between the cover plate and the partition wall of the rear housing, the number of parts, the processing time, and the cost can be reduced, and the problem of the O-ring detaching from the groove does not occur.

[0025] In addition, by including a gasket retainer to which the injection valve assembly is coupled to the partition wall so as to surround the step, internal leakage between the discharge chamber and the introduction chamber can be prevented by a single sealing member (gasket retainer).

[0026] The effects of the present invention are not limited to those described above, and it should be understood that all effects inferable from the detailed description of the present invention or the configuration of the invention described in the claims are included.

Brief Description of the Drawings

[0027]

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Best Mode for Carrying Out the Invention

[0028] Hereinafter, preferred embodiments of the scroll compressor according to the present invention will be described with reference to the accompanying drawings.

[0029] In addition, the terms described later are terms defined in consideration of the functions in the present invention, which can be changed according to the intentions or conventions of users and operators. The following embodiments do not limit the scope of the present invention, but are merely exemplary matters of the components presented in the claims of the present invention.

[0030] To clearly explain the present invention, parts not related to the explanation are omitted, and the same reference numerals are given to the same or similar components throughout the specification. Throughout the specification, when a part "includes" a certain component, this means that other components can be further provided, rather than excluding other components, unless otherwise specifically stated.

[0031] First, a scroll compressor according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4 and FIGS. 14 to 19.

[0032] As shown in FIG. 2, a scroll compressor according to an embodiment of the present invention includes a housing (100), a motor (200) provided in the housing (100), a rotating shaft (300) rotated by the motor (200), a swash scroll (400) that is interlocked with the rotating shaft (300) and performs a turning motion, a fixed scroll (500) that forms a compression chamber (C) together with the swash scroll (400), and a discharge valve (600) that is disposed on one surface of the fixed scroll (500) and opens and closes a discharge port (512) of the fixed scroll through which the refrigerant compressed in the compression chamber (C) is discharged.

[0033] And the compressor according to the present embodiment can further include an injection valve assembly (700) that forms an injection passage for guiding a refrigerant at an intermediate pressure from the outside of the housing (100) (in a vapor compression refrigeration cycle including a scroll compressor, a condenser, an expansion valve, and an evaporator, for example, downstream of the condenser) to the compression chamber (C) and opens and closes the injection passage.

[0034] Here, the injection passage includes an introduction port (133), an introduction chamber (I), an inlet (712), an inclined space (734), an outlet (736), and an injection port (514) to be described later, and is formed to extend from the rear housing (130) to the fixed scroll (500). The injection valve assembly (700) includes the inlet (712), the inclined space (734), and the outlet (736) and is interposed between the rear housing (130) and the fixed scroll (500).

[0035] Specifically, the housing (100) includes a center housing (110) through which the rotating shaft (300) passes, a front housing (120) that forms a motor accommodation space for accommodating the motor (200) together with the center housing (110), and a rear housing (130) that forms a scroll accommodation space for accommodating the swash scroll (400) and the fixed scroll (500) together with the center housing (110).

[0036] The center housing (110) includes a center mirror plate (112) that partitions a motor accommodation space and a scroll accommodation space to support a swivel scroll (400) and a fixed scroll (500), and a center side plate (114) that protrudes from the outer peripheral portion of the center mirror plate (112) toward the front housing (120). A bearing hole through which one end of the rotating shaft (300) penetrates and a back pressure chamber that presses the swivel scroll (400) toward the fixed scroll (500) are formed in the center of the center mirror plate (112). Here, an eccentric bush (310) that converts the rotational movement of the rotating shaft (300) into the swiveling movement of the swivel scroll (400) is formed at one end of the rotating shaft (300). And an intake passage (not shown) that guides the refrigerant flowing into the motor accommodation space to the scroll accommodation space can be formed in the outer peripheral portion of the center mirror plate (112) as will be described later.

[0037] The front housing (120) includes a front mirror plate (122) that faces the center mirror plate (112) and supports the other end of the rotating shaft (300), and a front side plate (124) that protrudes from the outer peripheral portion of the front mirror plate (122) and is fastened to the center side plate (114) to support the motor (200). Thereby, the center mirror plate (112), the center side plate (114), the front mirror plate (122), and the front side plate (124) form a motor accommodation space. And an intake port that guides the refrigerant of the intake pressure from the outside to the motor accommodation space can be formed in the front side plate (124).

[0038] As shown in FIGS. 3 and 4, the rear housing (130) includes a rear mirror plate (132) that faces the center mirror plate (112), a first annular wall (134) that protrudes from the rear mirror plate (132) and is located on the outermost side in the circumferential direction of the rear housing (130), a second annular wall (136) that protrudes from the rear mirror plate (132) and is accommodated in the first annular wall (134), and a partition wall (138) that protrudes from the rear mirror plate (132) and is accommodated in the second annular wall (136). At this time, the first annular wall (134), the second annular wall (136), and the partition wall (138) are formed to have different heights from each other.

[0039] The first annular wall (134) is formed in an annular shape having a diameter substantially equal to the outer peripheral portion of the center mirror plate (112) and is fastened to the outer peripheral portion of the center mirror plate (112) to form a scroll accommodation space. Further, the second annular wall (136) is formed in an annular shape having a diameter smaller than that of the first annular wall (134), and is brought into contact with the outer peripheral portion of the fixed mirror plate (510) of the fixed scroll (500) described later to form a discharge chamber (D) for accommodating the refrigerant discharged from the compression chamber (C). Here, by forming the second annular wall (136) so as to be in contact with the fixed mirror plate (510), when the rear housing (130) is fastened to the center housing (110), the fixed scroll (500) is pressurized toward the center housing (110) side, and the fastening force between the fixed scroll (500) and the center housing (110) can be improved to prevent leakage.

[0040] The partition wall (138) is formed in an annular shape having a diameter smaller than that of the second annular wall (136), is separated from the fixed mirror plate (510) of the fixed scroll (500), and forms an introduction chamber (I) for accommodating the refrigerant introduced through the introduction port (133) and covered by the cover plate (710) of the injection valve assembly (700) as described later.

[0041] A discharge port (131) for guiding the refrigerant in the discharge chamber (D) to the outside of the housing (100) is formed in the rear mirror plate (132). The discharge port (131) is formed to extend along the radial direction of the rear mirror plate (132) from the central portion to one side of the outer peripheral portion of the rear mirror plate (132). On the other hand, a tubular oil separator (not shown) for separating oil from the refrigerant can be provided inside the discharge port (131). Further, an introduction port (133) through which the refrigerant at intermediate pressure is introduced from the outside of the housing (100) is also formed in the rear mirror plate (132). The introduction port (133) is formed to extend along the radial direction of the rear mirror plate (132) from the other side of the outer peripheral portion to the central portion of the rear mirror plate (132) and is communicated with the introduction chamber (I). On the other hand, the discharge port (131) and the introduction port (133) can be formed such that the refrigerant in the discharge port (131) and the refrigerant in the introduction port (133) flow in a cross-flow direction with respect to each other.

[0042] In this way, when the discharge chamber (D), the discharge port (131), the introduction port (133), and the introduction chamber (I) are formed in the rear housing (130), at least a part of the introduction chamber (I) is accommodated in the discharge chamber (D), at least a part of the discharge port (131) is accommodated in the introduction chamber (I), and at least a part of the introduction port (133) is accommodated in the discharge chamber (D).

[0043] Then, in the partition wall (138), there are formed a fastening groove (138a) into which a fastening bolt (770) for fastening the gasket retainer (790) and the valve plate (730) of the injection valve assembly (700) to the partition wall (138) is inserted as described later, and a first positioning groove (138b) into which a positioning pin (780) for aligning the cover plate (710), the injection valve (720), the gasket retainer (790), and the valve plate (730) of the injection valve assembly (700) is inserted.

[0044] As shown in FIG. 2, the motor (200) includes a stator (210) fixed to the front side plate (124) and a rotor (220) rotated by interacting with the stator (210) inside the stator (210). The rotating shaft (300) passes through the center of the rotor (220) and is fastened to the rotor (220), but one end passes through the bearing hole of the center mirror plate (112) and the other end is supported by the front mirror plate (122).

[0045] The orbiting scroll (400) is interposed between the center mirror plate (112) and the fixed scroll (500), and includes a disk-shaped orbiting mirror plate (410), an orbiting wrap (420) protruding from the orbiting mirror plate (410) toward the fixed scroll (500) side, and a boss portion (430) protruding from the center of the orbiting mirror plate (410) to the opposite side of the orbiting wrap (420) and fastened to the eccentric bush (310).

[0046] As shown in FIGS. 3 and 14, the fixed scroll (500) includes a disk-shaped fixed mirror plate (510), a fixed wrap (520) protruding from the fixed mirror plate (510) and engaging with the swivel wrap (420), and a fixed side plate (530) protruding from the outer peripheral portion of the fixed mirror plate (510) and fastened to the center mirror plate (112).

[0047] The fixed mirror plate (510) includes a discharge port (512) for discharging the refrigerant in the compression chamber (C) to the discharge chamber (D), and an injection port (514) for guiding the refrigerant discharged from the injection valve assembly (700) to the compression chamber (C). The discharge port (512) is formed in plurality to prevent over-compression of the refrigerant, and the plurality of discharge ports (512) are opened and closed by a discharge valve (600) interposed between the fixed mirror plate (510) and the injection valve assembly (700).

[0048] Specifically, as shown in FIGS. 15 to 18, the compression chamber (C) is located on the centrifugal side in the radial direction of the scroll accommodation space, and includes a first compression chamber (C1) where the pressure of the refrigerant is in a first pressure range, a second compression chamber (C2) located on the centripetal side in the radial direction of the scroll accommodation space with respect to the first compression chamber (C1) and having a pressure of the refrigerant higher than the first pressure range, and a third compression chamber (C3) located on the centripetal side in the radial direction of the scroll accommodation space with respect to the second compression chamber (C2) and having a pressure of the refrigerant higher than the second pressure range. Huh.

[0049] Specifically, the first compression chamber (C1) includes a first outer compression chamber (C11) formed by the outer peripheral surface of the swivel wrap (420) and the inner peripheral surface of the fixed wrap (520), and a first inner compression chamber (C12) formed by the inner peripheral surface of the swivel wrap (420) and the outer peripheral surface of the fixed wrap (520). The second compression chamber (C2) includes a second outer compression chamber (C21) formed by the outer peripheral surface of the swivel wrap (420) and the inner peripheral surface of the fixed wrap (520), and a second inner compression chamber (C22) formed by the inner peripheral surface of the swivel wrap (420) and the outer peripheral surface of the fixed wrap (520). Huh.

[0050] At this time, the discharge port (512) is Third compression chamber C3A main discharge port (512a) formed on the center side of the stationary mirror plate (510) for discharging the refrigerant, a first sub-discharge port (512b) formed on the outer radial side of the stationary mirror plate (510) with respect to the main discharge port (512a) for discharging the refrigerant in the second outer compression chamber (C21), and a second sub-discharge port (512c) formed on the outer radial side of the stationary mirror plate (510) with respect to the main discharge port (512a) for discharging the refrigerant in the second inner compression chamber (C22), but formed on the opposite side of the first sub-discharge port (512b) with respect to the main discharge port (512a).

[0051] Further, the injection ports (514) are formed in plurality so as to supply all of the refrigerant discharged from the injection valve assembly (700) to a pair of two 1 compression chambers ( C1 ). That is, the injection ports (514) include a first injection port (514a) communicable with the 1 outer compression chamber (C 11 ) and a second injection port (514b) communicable with the 1 inner compression chamber (C 12 ), and the first injection port (514a) and the second injection port (514b) are formed on opposite sides with respect to an imaginary line connecting the first sub-discharge port (512b) and the second sub-discharge port (512c). However, it is not limited thereto, and the injection ports (514) can be formed in plurality on the same side with respect to an imaginary line connecting the first sub-discharge port (512b) and the second sub-discharge port (512c).

[0052] The injection ports (514) can be formed as long holes for increasing the flow rate of the refrigerant injected into the compression chamber (C). And the injection ports (514) can be formed with a constant cross-sectional shape so that pressure loss and flow rate loss do not occur in the process of the refrigerant passing through the injection ports (514). That is, the inner diameter of the injection ports (514) can be formed to a predetermined value regardless of the axial position of the injection ports (514).

[0053] Here, the injection ports (514) are the 1 outer compression chamber (C 11 ) and the 1 inner compression chamber (C 12) so that no pressure imbalance occurs between the first 1 outer compression chamber (C 11 ) and the second 1 inner compression chamber (C 12 ) can be formed to communicate simultaneously. That is, as shown in FIG. 19, when the communication between the first injection port (514a) and the 1 outer compression chamber (C 11 ) starts, the communication between the second injection port (514b) and the 1 inner compression chamber (C 12 ) can start. Also, preferably, the injection port (514) can be formed to be shielded from the 1 outer compression chamber (C 11 ) and the second 1 inner compression chamber (C 12 ) simultaneously. That is, as shown in FIG. 19, when the communication between the first injection port (514a) and the 1 outer compression chamber (C 11 ) ends, the communication between the second injection port (514b) and the 1 inner compression chamber (C 12 ) can end.

[0054] The fixed wrap (520) is formed to extend, for example, in a logarithmic spiral shape from the center of the fixed scroll (500) toward the outer peripheral side. The fixed side plate (530) is formed in an annular shape extending along the outer periphery of the fixed mirror plate (510) and can include a fixed wrap entry portion (532) connected to the fixed wrap (520) on one side. The axial height of the fixed wrap entry portion (532) is formed at the same level as the axial height of the fixed wrap (520) so that the refrigerant in the compression chamber (C) does not leak through the fixed wrap entry portion (532). Also, the radial thickness of the fixed wrap entry portion (532) is formed thicker than the radial thickness of the fixed wrap (520) so that the support rigidity of the fixed wrap (520) is improved. At this time, in order to reduce the weight and cost of the fixed scroll (500), the radial thickness of the portion of the fixed side plate (530) excluding the fixed wrap entry portion (532) can be formed thinner than the radial thickness of the fixed wrap entry portion (532).

[0055] Next, referring to FIGS. 5 and 6, the discharge valve (600) will be described. The discharge valve (600) is interposed between the fixed platen (510) and the injection valve assembly (700) to communicate and shield between the discharge port (512) and the discharge chamber (D).

[0056] The discharge valve (600) includes a main opening / closing portion (610) that opens and closes the main discharge port (512a), a first sub-opening / closing portion (630) that opens and closes the first sub-discharge port (512b), a second sub-opening / closing portion (650) that opens and closes the second sub-discharge port (512c), a fastening portion (670) fastened to the fixed platen (510), a main support portion (620) extending from the main opening / closing portion (610) to the fastening portion (670), a first sub-support portion (640) extending from the first sub-opening / closing portion (630) to the fastening portion (670), and a second sub-support portion (660) extending from the second sub-opening / closing portion (650) to the fastening portion (670).

[0057] The main opening / closing portion (610), the first sub-opening / closing portion (630), the second sub-opening / closing portion (650), the fastening portion (670), the main support portion (620), the first sub-support portion (640), and the second sub-support portion (660) of the discharge valve (600) can be integrally formed so as to minimize an increase in cost and weight due to the discharge valve (600). Further, the circumferential width of the fastening portion (670) is formed smaller than the distance between the first sub-opening / closing portion (630) and the second sub-opening / closing portion (650), and the fastening portion (670) can be fastened to the fixed platen (510) by one fastening member (680). Here, the one fastening member (680) is preferably fastened to the side of the relatively thick and high fixed lap entry portion (532) so that the discharge valve (600) can receive sufficient support even when fastened to the fixed platen (510) by one fastening member (680).

[0058] According to an embodiment, at least one of the first sub-support portion (640) and the second sub-support portion (660) can include an avoidance portion formed to be recessed toward the main support portion (620) in order to prevent at least one of the first sub-support portion (640) and the second sub-support portion (660) from interfering with the injection port (514).

[0059] Here, Third compression chamber C3 when the pressure of reaches the discharge pressure level, the main opening / closing part (610) opens the main discharge port (512a). At this time, if the pressure in the second outer compression chamber (C21) exceeds the second pressure range, the first sub-opening / closing part (630) opens the first sub-discharge port (512b) to lower the pressure in the second outer compression chamber (C21) to a level within the second pressure range. If the pressure in the second inner compression chamber (C22) exceeds the second pressure range, the second sub-opening / closing part (650) opens the second sub-discharge port (512c) to lower the pressure in the second inner compression chamber (C22) to a level within the second pressure range, preventing the pressure of the refrigerant discharged from the main discharge port (512a) from becoming excessively higher than the discharge pressure. That is, over-compression can be prevented.

[0060] On the other hand, the first sub-discharge port (512b) and the second sub-discharge port (512c) can be formed so as to communicate with the second outer compression chamber (C21) and the second inner compression chamber (C22) simultaneously so that no pressure imbalance occurs between the second outer compression chamber (C21) and the second inner compression chamber (C22). That is, when the communication between the first sub-discharge port (512b) and the second outer compression chamber (C21) starts, the communication between the second sub-discharge port (512c) and the second inner compression chamber (C22) can start. And preferably, the first sub-discharge port (512b) and the second sub-discharge port (512c) can be formed so as to be shielded from the second outer compression chamber (C21) and the second inner compression chamber (C22) simultaneously. That is, when the communication between the first sub-discharge port (512b) and the second outer compression chamber (C21) ends, the communication between the second sub-discharge port (512c) and the second inner compression chamber (C22) can end.

[0061] Next, with reference to FIGS. 3, 5, and 7 to 12, the injection valve assembly (700) will be described in detail. The injection valve assembly (700) is formed on the front end surface of the partition wall (138) so as to communicate and shield between the introduction chamber (I) and the injection port (514).

[0062] In particular, a part of the injection valve assembly (700) in the present invention is mounted on a step (139) provided on the partition wall (138) of the rear housing. Thereby, the injection valve assembly (700) itself can serve as a seal to prevent internal leakage between the discharge chamber (D) and the introduction chamber (I). As a result, a separate O-ring and groove processing for the O-ring are not required between the injection valve assembly (700) and the partition wall (138) of the rear housing, and the number of parts, processing time, and cost can be reduced, and the problem of the O-ring coming off from the groove does not occur.

[0063] Furthermore, as will be described later, the injection valve assembly (700) includes a gasket retainer (790) as a leakage prevention means together with an injection valve (720) for opening and closing the injection flow path. By coupling the gasket retainer (790) to the partition wall (138) so as to surround the step (139), internal leakage between the discharge chamber (D) and the introduction chamber (I) can be prevented by a single sealing member (gasket retainer).

[0064] Specifically, the injection valve assembly (700) includes a cover plate (710) mounted on a step (139) provided on the partition wall (138) to cover the introduction chamber (I), a gasket retainer (790) coupled to the partition wall (138) so as to surround the step (139), an injection valve (720) interposed between the cover plate (710) and the gasket retainer (790) for opening and closing the injection flow path, and a valve plate (730) coupled to the gasket retainer (790) for guiding the refrigerant at intermediate pressure to the injection port (514).

[0065] First, as shown in FIGS. 7 and 9, the cover plate (710) includes a cover plate upper surface (710a) facing the partition wall (138) and a cover plate lower surface (710b) facing the gasket retainer (790). The cover plate (710) further includes an inlet (712) for communicating the introduction chamber (I) with an inclined space (734) to be described later and a first positioning hole (716) communicating with the first positioning groove (138b) and penetrated by a positioning pin (780).

[0066] The inlet port (712) is formed to penetrate from the upper surface (710a) to the lower surface (710b) of the cover plate. In this embodiment, two inlet ports (712) are formed in the diagonal direction of the cover plate (710). That is, the inlet port (712) includes a first inlet port (712a) communicating with one side of the introduction chamber (I) and a second inlet port (712b) formed independently of the first inlet port (712a) and communicating with the other side of the introduction chamber (I). At this time, the first inlet port (712a) and the second inlet port (712b) are preferably formed as long holes for maximizing the valve lifting force and the refrigerant inflow rate.

[0067] The first positioning hole (716) is formed in the diagonal direction of the cover plate (710), preferably in the diagonal direction intersecting the diagonal where the inlet port (712) is formed, and can be formed to penetrate from the upper surface (710a) to the lower surface (710b) of the cover plate.

[0068] As shown in FIGS. 8 and 10, the step (139) is formed along the inner periphery of the partition wall (138). Thereby, the cover plate (710) can be mounted on the step (139) to cover the introduction chamber (I) inside the partition wall (138). At this time, the height (h) of the step (139) is preferably the same as the thickness (t) of the cover plate (710) so that the cover plate (710) does not protrude from the partition wall (138) and can be mounted inside the partition wall (138). However, some errors can be tolerated.

[0069] Also, the outer peripheral shape and dimensions of the step (139) are preferably the same as the peripheral shape and dimensions of the cover plate (710) so that the cover plate (710) can completely cover the introduction chamber (I). However, some errors can be tolerated.

[0070] As shown in FIG. 7, the injection valve (720) includes a first head (722a) that opens and closes a first inlet (712a), a first leg (724a) that supports the first head (722a), a second head (722b) that opens and closes a second inlet (712b), a second leg (724b) that supports the second head (722b), and a connecting portion (726) that connects the first leg (724a) and the second leg (724b). Here, the first head (722a), the first leg (724a), the second head (722b), the second leg (724b), and the connecting portion (726) are preferably integrally formed for reducing the number of parts, size, cost, and weight.

[0071] The first leg (724a) and the second leg (724b) are formed to be parallel to each other, and it is preferable in terms of compactness that the connecting portions between the first leg (724a) and the connecting portion (726) and between the second leg (724b) and the connecting portion (726) are formed on opposite sides of each other. That is, the first leg (724a) and the second leg (724b) are respectively connected to both ends of the connecting portion (726).

[0072] Further, the connecting portion (726) includes a second positioning hole (726a) that communicates with the first positioning hole (716) and is penetrated by a positioning pin (780). In this embodiment, the second positioning holes (726a) are respectively formed at both ends of the connecting portion (726), but it is not limited thereto.

[0073] Here, the injection valve (720) is fixed by being compressed between the cover plate (710) and the gasket retainer (790) without a separate fastening member for fixing the injection valve (720), which will be described in more detail below.

[0074] As shown in FIGS. 7 and 11, the gasket retainer (790) includes a gasket retainer upper surface (790a) facing the partition wall (138) and the cover plate (710), and a gasket retainer lower surface (790b) facing the fixed scroll (500) forming the back surface of the gasket retainer upper surface (790a). The gasket retainer (790) further includes a bead portion (792) protruding along the periphery on the gasket retainer upper surface (790a), and a retainer portion (794) serving as a retainer for the injection valve (720) and being inclined on the gasket retainer (790). At this time, the retainer portion (794) is inclined in the direction in which the injection valve (720) opens, that is, in the direction toward the valve plate (730). The retainer portion (794) is formed inside the bead portion (792).

[0075] The retainer portion (794) is for supporting the head (722) and the leg (724) of the injection valve (720) when the injection valve (720) opens the inlet (712), that is, when the head (722) and the leg (724) of the injection valve (720) move toward the valve plate (730) side and open. The maximum opening position of the injection valve (720) can be limited by the determined inclination of the retainer portion (794). For this purpose, the retainer portion (794) includes a first retainer portion (794a) for supporting the first head (722a) and the first leg (724a), and a second retainer portion (794b) for supporting the second head (722b) and the second leg (724b).

[0076] Here, it is preferable that the first retainer part (794a) and the second retainer part (794b) are formed to be inclined in directions intersecting with each other so as to correspond to the first leg part (724a) and the second leg part (724b). That is, the first retainer part (794a) and the second retainer part (794b) are inclined by a cut part on the gasket retainer (790), and the cut parts are formed in directions intersecting with each other. Specifically, in this embodiment, the cut part is formed in a U shape, and the inner part cut by the cut part in the gasket retainer (790) body is inclined to form the retainer part (794).

[0077] At this time, in order to maintain the inclination angle of the retainer part (794), a pair of wing parts (795) that connect both sides of the retainer part (794) and the gasket retainer (790) body facing it are provided on both sides of the retainer part (794). Thereby, a U-shaped main flow hole (790c) can be formed on one side of the pair of wing parts (795), and a pair of linear auxiliary flow holes (790d) can be formed on the other side. When the injection valve (720) is opened, the refrigerant flowing into the inlet (712) of the cover plate can flow into the inclined space (734) of the valve plate through the main flow hole (790c) and the pair of auxiliary flow holes (790d). By providing the pair of wing parts (795) in this way, the inclination angle of the retainer part (794) is maintained constant, and at the same time, durability can be maintained even when the retainer part (794) is continuously struck by the injection valve (720).

[0078] As shown in FIGS. 3 and 8, the gasket retainer (790) is compressed between the partition wall (138) and the valve plate (730). Thereby, the injection valve (720) can be compressed and fixed in position between the cover plate (710) and the gasket retainer (790), and at the same time, the gasket retainer (790) can seal between the partition wall (138) and the valve plate (730). By compressively coupling the gasket retainer (790) to the partition wall (138) so as to surround the step (139) in this way, internal leakage between the discharge chamber (D) and the introduction chamber (I) can be prevented by only a single gasket retainer (790). It is preferable that the peripheral shape and dimensions of the gasket retainer (790) are the same as the outer peripheral shape and dimensions of the partition wall (138).

[0079] In particular, the bead portion (792) is formed along the circumference so as to surround the injection valve (720) on the upper surface (790a) of the gasket retainer, but protrudes in the direction of the partition wall (138). Thereby, when the gasket retainer (790) is compressed between the partition wall (138) and the valve plate (730), the bead portion (792) can seal around the injection valve (720) with respect to the partition wall (138). Further, when the gasket retainer (790) and the injection valve (720) are assembled, the bead portion (792) is pressed in the direction toward the valve plate (730) by the partition wall (138) around the gasket retainer. In this way, the inner portion of the gasket retainer (790) facing the injection valve (720) is bent by receiving a force in the direction opposite to the direction in which the bead portion (792) is pressed, that is, in the direction toward the injection valve (720). This is illustrated by the dotted arrow in FIG. 8. Thereby, since the inner portion of the gasket retainer (790) can bring the injection valve (720) into close contact with the cover plate (710) for sealing, leakage of the refrigerant can be prevented. For that purpose, the protruding height of the bead portion (792) can be formed to be greater than or equal to the thickness of the injection valve (720).

[0080] And the gasket retainer (790) further includes a third fastening hole (796) formed through the outer peripheral portion of the gasket retainer from the gasket retainer upper surface (790a) to the gasket retainer lower surface (790b) so as to communicate with the second fastening hole (714) and be penetrated by the fastening bolt (770). Further, the gasket retainer (790) further includes a third positioning hole (798) formed through the gasket retainer from the gasket retainer upper surface (790a) to the gasket retainer lower surface (790b) so as to communicate with the second positioning hole (726a) and into which the positioning pin (780) is inserted. In this embodiment, the third positioning hole (798) is formed between the first and second retainer portions (794a, 794b), but is not limited thereto.

[0081] Thus, by forming the third fastening hole (796) radially outside the bead portion (792) and the third positioning hole (798) radially inside the bead portion (792), the gasket retainer (790) can be assembled to be accurately aligned with other components of the injection valve assembly inside the bead portion, and the bead portion (792) can be compressed by the fastening force of the fastening bolt (770) to perform sealing outside the bead portion.

[0082] Next, as shown in FIGS. 7 and 12, the valve plate (730) includes a valve plate upper surface (730a) facing the gasket retainer (790) and a valve plate lower surface (730b) facing the fixed scroll (500) while forming the back surface of the valve plate upper surface (730a). Further, the valve plate (730) further includes a protruding portion (732) protruding from the valve plate lower surface (730b) toward the injection port (514) side. That is, the valve plate (730) includes a first protruding portion (732a) protruding from one side of the valve plate lower surface (730b) toward the first injection port (514a) side and a second protruding portion (732b) protruding from the other side of the valve plate lower surface (730b) toward the second injection port (514b) side.

[0083] At this time, the first protruding portion (732a) includes a first large-diameter portion (732aa) protruding from one side of the lower surface of the valve plate (730b) toward the first injection port (514a) and a first small-diameter portion (732ab) protruding from the first large-diameter portion (732aa) toward the first injection port (514a). The outer diameter of the first large-diameter portion (732aa) is formed to be larger than the outer diameter of the first small-diameter portion (732ab). Similarly, the second protruding portion (732b) includes a second large-diameter portion (732ba) protruding from the other side of the lower surface of the valve plate (730b) toward the second injection port (514b) and a second small-diameter portion (732bb) protruding from the second large-diameter portion (732ba) toward the second injection port (514b). The outer diameter of the second large-diameter portion (732ba) is formed to be larger than the outer diameter of the second small-diameter portion (732bb).

[0084] Further, the valve plate (730) includes a first inclined space (734a) for accommodating the refrigerant flowing in through the first inlet (712a), a second inclined space (734b) for accommodating the refrigerant flowing in through the second inlet (712b), a first outlet (736a) formed in the first protruding portion (732a) for guiding the refrigerant in the first inclined space (734a) to the first injection port (514a), and a second outlet (736b) formed in the second protruding portion (732b) for guiding the refrigerant in the second inclined space (734b) to the second injection port (514b).

[0085] The first inclined space (734a) and the second inclined space (734b) are formed to be recessed from the upper surface of the valve plate (730a). Further, the first inclined space (734a) and the second inclined space (734b) are separated from each other and are preferably formed to be inclined in a direction intersecting with each other corresponding to the first retainer portion (794a) and the second retainer portion (794b) so that the first retainer portion (794a) and the second retainer portion (794b) can be mounted respectively.

[0086] The first outlet (736a) is formed to be recessed from the tip surface of the first protrusion (732a), more precisely from the tip surface of the first small-diameter portion (732ab), and extends to the first large-diameter portion (732aa) and communicates with the first inclined space (734a). The second outlet (736b) is formed to be recessed from the tip surface of the second protrusion (732b), more precisely from the tip surface of the second small-diameter portion (732bb), and extends to the second large-diameter portion (732ba) and communicates with the second inclined space (734b). However, it is not limited to this. Needless to say, the first inclined space (734a) and the first outlet (736a) can be connected by a separate connecting flow path, and the second inclined space (734b) and the second outlet (736b) can be connected by a separate connecting flow path.

[0087] As shown in FIG. 3, the lower surface (730b) of the valve plate is formed to be separated from the fixed mirror plate (510) such that the discharge valve (600) is interposed between the fixed mirror plate (510) and the lower surface (730b) of the valve plate, and the refrigerant discharged from the discharge port (512) can flow into the discharge chamber (D).

[0088] The valve plate (730) further includes a first fastening hole (739a) formed to penetrate from the upper surface (730a) to the lower surface (730b) of the valve plate at the outer peripheral portion of the valve plate (730) so as to communicate with the third fastening hole (796) and be penetrated by the fastening bolt (770). The valve plate (730) further includes a second positioning groove (739b) formed to be recessed from the upper surface (730a) of the valve plate so as to communicate with the third positioning hole (798) and the positioning pin (780) is inserted therein.

[0089] Thereby, one end of the positioning pin (780) penetrates through the first positioning hole (716) and is inserted into the first positioning groove (138b), and the other end of the positioning pin (780) penetrates through the second positioning hole (726a) and the third positioning hole (798) and is inserted into the second positioning groove (739b), so that the cover plate (710), the injection valve (720), the gasket retainer (790), and the valve plate (730) of the injection valve assembly (700) can be aligned. Further, the fastening bolt (770) penetrates through the first fastening hole (739a) and the third fastening hole (796) and is fastened to the fastening groove (138a), so that the injection valve assembly (700) can be fastened to the rear housing (130).

[0090] On the other hand, as shown in FIGS. 3, 6, and 13, the fixed mirror plate (510) further includes a small-diameter part insertion groove (516) so that refrigerant leakage does not occur when the refrigerant flows from the injection valve assembly (700) into the first injection port (514a) and the second injection port (514b). That is, the fixed mirror plate (510) further includes a first small-diameter part insertion groove (516a) into which the first small-diameter part (732ab) is inserted and a second small-diameter part insertion groove (516b) into which the second small-diameter part (732bb) is inserted.

[0091] Specifically, the fixed mirror plate (510) includes a fixed mirror plate upper surface (510a) facing the injection valve assembly (700) and a fixed mirror plate lower surface (510b) facing the swivel scroll (400) formed on the back of the fixed mirror plate upper surface (510a).

[0092] The first small-diameter part insertion groove (516a) is formed so as to be recessed from the upper surface (510a) of the fixed mirror plate toward the lower surface (510b) of the fixed mirror plate, and the first small-diameter part (732ab) is inserted therein. The first injection port (514a) is formed so as to be recessed from the lower surface (510b) of the fixed mirror plate toward the upper surface (510a) of the fixed mirror plate and is communicated with the first small-diameter part insertion groove (516a). The second small-diameter part insertion groove (516b) is also formed so as to be recessed from the upper surface (510a) of the fixed mirror plate toward the lower surface (510b) of the fixed mirror plate, and the second small-diameter part (732bb) is inserted therein. The second injection port (514b) is formed so as to be recessed from the lower surface (510b) of the fixed mirror plate toward the upper surface (510a) of the fixed mirror plate and is communicated with the second small-diameter part insertion groove (516b).

[0093] Here, so that the first small-diameter part (732ab) can be inserted into the first small-diameter part insertion groove (516a) and no pressure loss and flow rate loss occur in the process in which the refrigerant flows from the injection valve assembly (700) to the first injection port (514a), the inner diameter of the first small-diameter part (the inner diameter of the first outlet (736a)) is formed to be larger than or the same as the inner diameter of the first injection port (514a), and the inner diameter of the first small-diameter part insertion groove (516a) can be formed at the same level as the outer diameter of the first small-diameter part (732ab).

[0094] Also, so that the second small-diameter part (732bb) can be inserted into the second small-diameter part insertion groove (516b) and no pressure loss and flow rate loss occur in the process in which the refrigerant flows from the injection valve assembly (700) to the second injection port (514b), the inner diameter of the second small-diameter part (the inner diameter of the second outlet (736b)) is formed to be larger than or the same as the inner diameter of the second injection port (514b), and the inner diameter of the second small-diameter part insertion groove (516b) can be formed at the same level as the outer diameter of the second small-diameter part (732bb).

[0095] On the one hand, the outer diameter of the first large-diameter portion (732aa) is formed to be larger than the inner diameter of the first small-diameter portion insertion groove (516a) so that the first large-diameter portion (732aa) is not inserted into the first small-diameter portion insertion groove (516a). Thereby, when the injection valve assembly (700) is fastened to the fixed scroll (500), a sealing member (760) can be interposed between the tip surface of the first large-diameter portion (732aa) and the upper surface of the fixed mirror plate (510a). The thickness of the sealing member (760) before deformation can be formed to be larger than or the same as the gap between the tip surface of the first large-diameter portion (732aa) and the upper surface of the fixed mirror plate (510a) so that the sealing member (760) can be compressed between the tip surface of the first large-diameter portion (732aa) and the upper surface of the fixed mirror plate (510a).

[0096] And the protruding length of the first small-diameter portion (732ab), that is, the axial length between the tip surface of the first large-diameter portion (732aa) and the tip surface of the first small-diameter portion (732ab), can be formed to be larger than the thickness of the sealing member (760) before deformation and smaller than or the same as the sum of the thickness of the sealing member (760) before deformation and the axial depth of the first small-diameter portion insertion groove (516a). Thereby, the tip surface of the first small-diameter portion (732ab) does not contact the bottom surface of the first small-diameter portion insertion groove (516a), and the sealing member (760) can be compressed between the tip surface of the first large-diameter portion (732aa) and the upper surface of the fixed mirror plate (510a).

[0097] Similarly, the outer diameter of the second large-diameter portion (732ba) is formed to be larger than the inner diameter of the second small-diameter portion insertion groove (516b) so that the second large-diameter portion (732ba) is not inserted into the second small-diameter portion insertion groove (516b). Thereby, when the injection valve assembly (700) is fastened to the fixed scroll (500), a sealing member (760) can be interposed between the tip surface of the second large-diameter portion (732ba) and the upper surface of the fixed mirror plate (510a) in a compressible manner.

[0098] Then, the protruding length of the second small-diameter portion (732bb), that is, the axial length between the front end surface of the second large-diameter portion (732ba) and the front end surface of the second small-diameter portion (732bb), can be formed to be larger than the thickness of the sealing member (760) before deformation and smaller than or equal to the sum of the thickness of the sealing member (760) before deformation and the axial depth of the second small-diameter portion insertion groove (516b). Thereby, the front end surface of the second small-diameter portion (732bb) is not in contact with the bottom surface of the second small-diameter portion insertion groove (516b), and the sealing member (760) can be compressed between the front end surface of the second large-diameter portion (732ba) and the upper surface of the fixed mirror plate (510a).

[0099] On the other hand, as shown in FIG. 6, a third groove (518) and a fourth groove (519) can be formed in the fixed mirror plate (510).

[0100] The third groove (518) is for reducing the contact area between the main opening and closing portion (610) of the discharge valve (600) and the fixed mirror plate (510) to reduce the collision noise, and for collecting and discharging foreign matters to prevent foreign matters from mixing between the main opening and closing portion (610) and the fixed mirror plate (510). It is formed in an annular shape that is recessed from the upper surface of the fixed mirror plate (510a) and surrounds the periphery of the main discharge port (512a). The inner peripheral portion of the third groove (518) is formed to overlap the outer peripheral portion of the main opening and closing portion (610) in the axial direction, and the outer peripheral portion of the third groove (518) can be formed not to overlap the main opening and closing portion (610) in the axial direction. That is, the inner diameter of the third groove (518) is formed smaller than the outer diameter of the main opening and closing portion (610), and the outer diameter of the third groove (518) can be formed larger than the outer diameter of the main opening and closing portion (610). This is to ensure that the foreign matters collected in the third groove (518) are discharged to the discharge chamber (D) side.

[0101] The fourth groove (519) is for collecting and discharging foreign matters to prevent foreign matters from mixing between the main support portion (620), the first sub-support portion (640), and the second sub-support portion (660) (hereinafter referred to as the support portion) of the discharge valve (600) and the fixed mirror plate (510). It is formed to be recessed from the upper surface (510a) of the fixed mirror plate at a position facing the support portion of the discharge valve (600). The fourth groove (519) is formed in an elongated hole shape, but the central portion of the fourth groove (519) is formed to overlap the support portion of the discharge valve (600) in the axial direction, and both ends of the fourth groove (519) can be formed not to overlap the support portion of the discharge valve (600) in the axial direction. That is, the major axis direction of the fourth groove (519) and the width direction of the support portion of the discharge valve (600) are parallel to each other, and the major axis length of the fourth groove (519) can be formed to be larger than the width of the support portion of the discharge valve (600). This is to allow the foreign matters collected in the fourth groove (519) to be discharged toward the discharge chamber (D) side.

[0102] Hereinafter, the operation and effects of the scroll compressor according to this embodiment will be described. When power is applied to the motor (200), the rotating shaft (300) rotates together with the rotor (220), and the orbiting scroll (400) receives the transmission of the rotational force from the rotating shaft (300) through the eccentric bush (310) and performs an orbiting motion. Thereby, the compression chamber (C) continuously moves toward the center side while its volume decreases.

[0103] Thereby, the refrigerant sucked into the compression chamber (C) is compressed while moving toward the center side along the movement path of the compression chamber (C) and is discharged into the discharge chamber (D) through the discharge port (512). The refrigerant at the discharge pressure discharged into the discharge chamber (D) is discharged to the outside of the compressor through the discharge port (131). At this time, the refrigerant at the suction pressure can flow into the compression chamber (C) through the suction port, the motor accommodation space, the suction flow path, and the scroll accommodation space.

[0104] In addition, the scroll compressor according to the present embodiment includes an injection flow path (introduction port (133), introduction chamber (I), injection valve assembly (700), and injection port (514)) for guiding refrigerant at an intermediate pressure to the compression chamber (C), and can compress and discharge not only the refrigerant at the suction pressure but also the refrigerant at the intermediate pressure. That is, the suction refrigerant flowing into the housing (100) through the evaporator flows in through the front housing (120) and is introduced into the compression chamber (C), and at least a part of the refrigerant discharged to the outside of the housing (100) can flow in from the outside of the housing (100) in an intermediate pressure state before passing through the evaporator and flow into the compression chamber (C) through the injection flow path. Thereby, the refrigerant discharge amount can be increased compared to when only the refrigerant at the suction pressure is sucked, compressed, and discharged, and the performance and efficiency of the compressor can be improved.

[0105] In addition, by including the rear housing (130) not only the discharge chamber (D) and the discharge port (131) but also the introduction port (133) and the introduction chamber (I), that is, by integrally forming the rear housing (130) having the discharge chamber (D), the discharge port (131), the introduction port (133), and the introduction chamber (I), the possibility of leakage can be reduced, and the size, cost, and weight can be reduced.

[0106] The present invention is not limited to the specific embodiments and descriptions described above, and any person having ordinary knowledge in the technical field to which the present invention pertains can make various modifications without departing from the gist of the present invention claimed in the claims, and such modifications are within the protection scope of the present invention.

Industrial Applicability

[0107] The present invention relates to a scroll compressor, and more specifically, to a scroll compressor that can improve the performance and efficiency of the compressor by introducing not only the refrigerant at the suction pressure but also the refrigerant at the intermediate pressure into the compression chamber of the scroll compressor and increasing the refrigerant discharge amount discharged from the compression chamber.

Explanation of Reference Numerals

[0108] 100 Housing 110 Center housing 112 Center mirror plate 114 Center side plate 120 Front housing 122 Front mirror plate 124 Front side plate 130 Rear housing 131 Discharge port 132 Rear mirror plate 133 Introduction port 134 First annular wall 136 Second annular wall 138 Partition wall 139 Step 200 Motor 210 Stator 220 Rotor 300 Rotating shaft 310 Eccentric bush 400 Swinging scroll 410 Swinging mirror plate 420 Swinging wrap 430 Boss part 500 Fixed scroll 510 Fixed mirror plate 512 Discharge opening 514 Injection port 516 Small-diameter part insertion groove 518 Third groove 519 Fourth groove 520 Fixed wrap 530 Fixed side plate 532 Fixed wrap entry part 600 Discharge valve 610 Main opening / closing part 620 Main support part 630 First sub-opening / closing part 640 First sub-support part 650 Second sub-opening / closing part 660 Second sub-support part 670 Fastening part 680 Fastening member 700 Injection valve assembly 710 Cover plate 712 Inlet 716 First positioning hole 720 Injection valve 722 Head 724 Leg 726 Connecting part 730 Valve plate 732 Protrusion 734 Inclined space 736 Outlet 739a First fastening hole 739b Second positioning groove 760 Sealing member 770 Fastening bolt 780 Positioning pin 790 Gasket retainer 792 Bead part 794 Retainer part 795 Wing part 796 Third fastening hole 798 Third positioning hole

Claims

1. A housing, a motor provided within the housing, a rotating shaft rotated by the motor, a swivel scroll that is swiveled in conjunction with the rotating shaft, and a fixed scroll that forms a compression chamber together with the swivel scroll, wherein the housing includes a rear housing that forms a discharge chamber for accommodating refrigerant discharged from the compression chamber, an injection valve assembly is provided between the fixed scroll and a partition wall of the rear housing to partition an introduction chamber through which refrigerant flows into the rear housing from outside the housing and guide the refrigerant in the introduction chamber to the compression chamber, the partition wall is provided with a step on which a part of the injection valve assembly is mounted, the partition wall protrudes from a rear end plate of the rear housing so as to form a space of the introduction chamber inside, and the step is formed along the inner periphery of the partition wall, the injection valve assembly includes a gasket retainer for preventing leakage between the discharge chamber and the introduction chamber, and the gasket retainer is coupled to the partition wall so as to surround the step, the injection valve assembly further includes a cover plate that is mounted on the step formed inside the partition wall, covers the introduction chamber from the inside of the partition wall, and has an inlet through which refrigerant in the introduction chamber flows in, an injection valve that is interposed between the cover plate and the gasket retainer and opens and closes the inlet, and a valve plate that is coupled to the gasket retainer and has an outlet through which the refrigerant flowing in through the inlet flows out. The scroll compressor is characterized by further including the above components.

2. The scroll compressor according to claim 1, wherein the peripheral shape and dimensions of the gasket retainer are the same as the outer peripheral shape and dimensions of the partition wall.

3. The scroll compressor according to claim 1, wherein the outer peripheral shape and dimensions of the step are the same as the peripheral shape and dimensions of the cover plate.

4. The scroll compressor according to claim 1, wherein the height (h) of the step is the same as the thickness (t) of the cover plate.

5. The scroll compressor according to claim 1, wherein the gasket retainer is compressed between the partition wall and the valve plate, and the injection valve is compressed between the gasket retainer and the cover plate.

6. The gasket retainer It includes a bead portion protruding from the upper surface of the gasket retainer facing the partition wall, The scroll compressor according to claim 5, wherein the bead portion surrounds the injection valve.

7. When the gasket retainer is assembled between the partition wall and the valve plate, the bead portion is pressed by the partition wall in a direction toward the valve plate, and an inner portion of the gasket retainer facing the injection valve bends in a direction toward the injection valve. The scroll compressor according to claim 6, characterized in that:

8. The gasket retainer, The scroll compressor according to claim 6, further comprising one or more retainer portions inclined in a direction in which the injection valve is opened.

9. The scroll compressor according to claim 1, characterized in that a fastening bolt passes through the valve plate and the gasket retainer and is fastened to the rear housing.

10. The scroll compressor according to claim 1, characterized in that one end of the positioning pin is inserted into the valve plate, passes through the gasket retainer, the injection valve, and the cover plate, and the other end is inserted into the rear housing.

11. The housing further includes a center housing through which the rotating shaft passes, and a front housing that forms a motor accommodation space for accommodating the motor together with the center housing, The suction refrigerant flows in through the front housing and is introduced into the compression chamber, and at least a part of the refrigerant discharged to the outside of the housing flows into the introduction chamber from the outside of the housing in an intermediate pressure state and then flows into the compression chamber through the injection valve assembly. The scroll compressor according to claim 1, characterized in that:

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